Public bug reported:
See attached dmesg outputs for booting kernels 4.11.x (working) and
4.13.x (not working).
dmesg-4.11.0-14-good.txt shows the dmesg output when booting kernel 4.11.x.
btrfs scans for devices after all 4 (sda, sdb, sdc, sdd) of the devices have
been discovered by the kernel. The btrfs RAID1 filesystem mounts, and
everything is good.
dmesg-4.13.0-36-fail.txt shows the dmesg output when booting kernel 4.13.x.
btrfs scans for devices after only 2 (sda, sdb) of the devices have been
discovered by the kernel. The btrfs RAID1 filesystem fails to mount ("failed
to read the system array: -5"). The remaining 2 devices (sdc, sdd) are
discovered by the kernel immediately afterward. At the end of the log, I run
`btrfs device scan` and mount the filesystem manually.
Hardware:
HP ProLiant MicroServer Gen8
4x WDC WD20EFRX
** Affects: linux-hwe-edge (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "dmesg.zip"
https://bugs.launchpad.net/bugs/1752961/+attachment/5067365/+files/dmesg.zip
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https://bugs.launchpad.net/bugs/1752961
Title:
With kernel 4.13 btrfs scans for devices before all devices have been
discovered
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